The South Florida clinic suspected by Major League Baseball investigators of being a source of performance-enhancing drugs for more than 30 players, including Alex Rodriguez and Melky Cabrera, in some instances obtained the banned substances through forged prescription forms, according to documents obtained by "Outside the Lines."

Anthony Bosch, the self-described biochemist who operated a series of wellness clinics, used prescription forms that contained forged signatures, stamped with the names and license numbers of legitimate physicians who apparently were unaware of the scheme, sources and documents indicate. Those drugs were prescribed to Bosch's friends and associates and then delivered to professional athletes in order to avoid a paper trail, sources said.

Already the subject of a civil lawsuit filed by MLB and a Florida Department of Health investigation, Bosch could face possible felony criminal charges if tied to forged medical prescriptions, as well as fraud for acting as a medical doctor.

The signed prescriptions are among a folder full of documents obtained by "Outside the Lines" that also identify players Bosch is believed to have dealt with, some of whom he personally visited during spring training and in-season.

The documents show:

• Multiple prescription forms bearing the purported signature of Dr. Daniel Carpman, a Coral Gables anti-aging specialist who denies signing the forms. The claim by the one-time Bosch associate -- who says he ended their relationship over concerns about Bosch's operation -- is supported by a forensic handwriting expert retained by "Outside the Lines."

• That Biogenesis relied on compounding pharmacies as a source for producing creams and "troches," or lozenges, containing, in some cases, amounts of testosterone nearly 15 times the levels available by prescription at neighborhood or traditional pharmacies. The levels might be a clue as to why at least five MLB players associated with Bosch have so far tested positive for substances banned by baseball, though clinic insiders also suggest some may have used more than the recommended amounts.

• That Bosch, 49, incorporated into his treatments peptides such as CJC and GHRP, which are designed to trigger the body's release of human growth hormone.

• That HGH is referenced next to three players: injured New York Yankees star Rodriguez, San Diego Padres catcher Yasmani Grandal and minor league pitcher Cesar Carrillo -- the latter two having been suspended by Major League Baseball, though not related to HGH. Grandal is suspended the first 50 games of this season after testing positive for elevated testosterone levels, while Carrillo, a minor league player not protected by the players' union -- was suspended 50 games for his name having appeared in Biogenesis documents, and another 50 for lying to MLB about not knowing Bosch.

• Biogenesis records also link Rodriguez, Grandal and Carrillo with Actovegin, a drug extracted from calf's blood that is not approved for use in the United States.

Health-care experts say Bosch was able to operate by exploiting loopholes in Florida law, which provides only limited oversight to the distribution of prescription drugs. One compounding pharmacy, however, says it suspected Biogenesis might be distributing anabolic steroids and terminated its relationship with the clinic last year.